If you’ve got an Echo device at home, you’ve almost certainly played a few rounds of “stump Alexa,” asking Amazon’s assistant increasingly arcane questions in an attempt to elicit some baffled response. After all, Amazon doesn’t have the advantage of Google’s deep Knowledge Graph. Amazon’s just opened that door, with an invite-only program that asks customers to submit answers to Alexa’s more difficult questions. Amazon has been testing Alexa Answers internally, adding more than 100,000 responses in the past month alone. Once responses are added, Alexa will have access to them, noting that they’re from “an Amazon customer” — one assumes to take a bit of the heat off of the assistant.